Ignition composition



I Patented Feb. 1935 IGNITION COMPOSITION Harvey B. Alexander, Kingston, N. Y., aasignor to Hercules Powder Company, Wilmington, Del.,. a corporation of Delaware No Drawing. Application M23, 1933, Serial No. 672,466

. 9 Claims. (01. 52-2) This invention relates to an ignition composiany desired form of blasting cap in any usual tion, adapted more especially for use in blasting manner, it being noted that no air space need be caps. left, since the composition develops practically The ignition compostion in accordance with no gas on burn 1 '5 this invention is adaptable for use in various types As illustrative, the composition may be loaded 5 0! blasting caps, but will-be found of special adloosely into any form of ventless delay capasvmme forum in delay caps, and will be readily sembly above e fuse a d th usu s p u p us ignited or flred by means of a fuse or electrically. holding the usual bridge wire placed above the- The ignition composition in accordance with loosely loaded composition with the bridge wire this invention will be found especially adaptable embedded in the compositionmi rly, th oom- 10 g for use in ventless delay caps, since on burning it position may be loosely loaded into any ordinary will produce little or no gas. Further, with use or blasting cap above the priming charge.

the composition misiires are avoided, since, if the A be we n he two mp i i n m d i h quantity used is not excessive, it will not cause invention as described above, it W be n t rupture of a firing circuit arranged for the firing that this composition including selenium and lead 15 0! a series 01 caps. 'Ihe advantage of the com-- will be found to be markedly p i r ver the position for use in caps arranged to be fired in mp i n including e enium a and series is due not only to the fact that it will burn consequence 'the former will generally be prewithout the production of any material amount e red Over the latter.

so of gas and hence when used in ordinarily suit- W I Claim and desire t Protect y tt r able amounts will not rupture the cap casing or Patent is:

dislodge the bridge wire, but also to the fact that 1. A s lid i i n mp i i n in udi as inthe residue left after burning is, for a short time s d n s s l n um and a m t l f m t r up .conductiveoi electric current. Hence, since the consisting of le d nd tin.

firing of the ignition composition does notinstant- A Solid gnition composition including in iii-- g5 1 interrupt t electric circuit, as m the case, timate admixture in finely divided form selenium for m, g 1 mm, current 111 pass and a metal from the group consisting oi lead through a series 0! caps for a longer period than and t the ordinary caps of the prior t and 3. A solid ignition composition including in slow firing caps are given more pperadmixture m form Selemmw m than heretof re nium and a metal from the group consisting of m the broad standpoint the ignition compo lead and tin, the selenium and metal from said sitionin accordance with this invention comprises group being Present in chemically equivalent a mixture of selenium and lead or tin. The inamountsa u wm de/simbly be m finely divided mm 4. A solid ignition composition including in in- ,ndm mtimat ixture ti mate' admixture divided iorm sele- The position may include selenium and lead mum and lead or an m We "mm m moms. Thus, for 5. A solid ignition composition including in inmple 8 86111111111114; g may include timate admixture in finely divided iorm selenium 40 lead in amount within about the range 435% v and lead in amount within about the range 40- 40 while, for example, a selenium-tin mixture may" 6. An ignition composition including in inincgiggim in amount within about the range te i t e n ely E vided to 1e mm the meme standpoint the lead or tin about 27.6% and lead about 72.4%.

wm be proportioned to the selenium on the basis 7. A solidignition composition including in in- 45 timate admixture in finely divided form selenium and tin.

8. A solid igniton composition including in intimate admixture in finely divided form selenium of approximately chemical equivalency. Thus, a selenium-lead composition may include selenium about 27.6% and lead about 72.4%; while a selenium-tin composition may include selenium so about 40.0% and unabout 60.0% and tin in amount within about the range 5o Inpreparms anignition compositioninaccordg T ignition composition including m ance with this invention the ingredients will be timate admixture in finely divided form selenium reduced to a finely form and W111 M inabout 40-0% and t about timately admixed by any suitable procedure.

66 The ignition composition may be loaded into HARVEY .B. ALEXANDER. 

